Multiple-circuit selector switch device



March 4, 1958 A. AVDEENKO 2,325,773

MULTIPLE-CIRCUIT SELECTOR SWITCH DEVICE 3 Sheets-Sheet 1 Filed NOV. 8,1954 FII v@ o o.

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l' INVEN TOR. ,4f/,470; AvaEEf/Ko .Illlll Arron/Veys MULTlPLE-CRCUHSELECTOR KETCH EEVEQE Anatol Avdeenko, Rochester, N. Y., assigner toCleveland Patents, incorporated, Cleveland, Sirio, corporation of OhioApplication November S, 1954, Serial No. 467,429

15 Claims. (Cl. Miti-46) This invention relates to multiple-circuitselector switch devices, and, as its principal object, aims to provide anovel selector switch device of a simple and practical construction andin which a control card removably inserted into a guideway and having apattern of punched openings and impertorate areas automatically selectsthe individual switches to be actuated.

This novel selector switch device can be applied to various kinds ofservice, but is especially useful in tubetesters lor testing electrontubes and is hereinafter described as applied to that use but withoutany intention of limiting the invention solely to that specificapplication.

Another object is to provide a selector switch device in which theindividual switches have stems engageable by the imperforate areas ofthe control card for selecting and actuating the desired switches, andin which a movable actuating means for causing the card-to-stemengagement includes an electrically energizable means controlled by acontrol switch.

A further object is to provide such a card-controlled switch device inwhich the control card is insertable in a guideway and in which thecontrol switch is actuatable in response to movement of the card in theguideway, preferably by a direct engagement of the card with the controlswitch upon substantially a full movement of the card into the guideway.

Still another object is to provide a card-controlled selector switchdevice of the character above indicated in which a spring pressureresponsive actuating means is employed for causing the engagement of theswitch stems by the impertorate areas of the control card, and in whichsuch spring pressure responsive means becomes eective upon the releaseof a locking means therefor.

Yet another object is to provide a card-controlled selector switchdevice of the character mentioned above in which the guideway for thecontrol card is in a movable carrier, and in which the actuating meansfor the carrier includes a movable cam and an electromagnetic devicewhose energizing circuit is controlled by a control switch.

Additionally, this invention provides a card-controller selector switchdevice of the kind referred to above in which a manual means is operableto load the spring sans, and in which a switch-controlledelectromagnetic device operates to release the locking means forrendering the spring means eiective.

Other objects and advantages of the invention will be apparent in 'theollowing detailed description and in the accompanying sheets of drawingsforming a part hereof and in which:

Fig. l is a partial plan view of a selector switch device embodying thepresent invention and which shows the switch device being used in atube-tester and as having the control card in its fully insertedposition;

Fig. 2 is a partial front elevation of the selector switch deviceshowing the same with the control card removed and with the individualswitches in open position;

Patented Mar. 4, 1958 Fig. 3 is a partial front elevation similar toFig. 2, but showing the control card inserted and with certain of theindividual switches actuated to their closed position;

Fig. 4 is a partial transverse vertical section taken on section line 44 of Fig. l and showing the individual switches on a larger scale;

Fig. 5 is another partial front elevation further illustrating theactuating and control means of the switch device;

Fig. 6 is a plan view showing one of the control cards in detachedrelation; and

Fig. 7 is a fragmentary elevational view further illustrating a cammember of the actuating and control means.

In the accompanying drawings, the multiple-circuit card-controlledselector switch device i is shown, by way of example, as being embodiedin a tube-tester 11 for testing electron tubes of different types. Theswitch device l@ is mounted on a support plate l2 and, when this switchdevice is embodied in such a tube-tester, the support plate forms thecover of the housing of the tubetester. As here shown, the support platel2 also forms amount for a plurality or tube sockets i3 and 14 adaptedto receive electron tubes of different types as well as a mount for anindicator or meter l for indicating the quality or other characteristicsof the tubes being tested.

The selector' switch device l@ comprises, in general, a supportstructure le carrying a baril; of individual switches 17 havingprojecting actuating stems lid, and a control card El) removablyinserted in a guideway 2l of a card holder or carrier 2 for cooperationwith the Stems 1%. The switch device also comprises actuating andcontrol means 23 for the carrier for causing movement of the controlcard Ztl by which the stems 18 of the desired switches 17 are selectedand actuated.

The support structure le comprises a pair upper and lower plate members2141- and 25' made ot suitable insulating material and held in spacedrelation by spacer members 26 disposed therebetween. The supportstructure lli is attached to the cover i2 by suitable connecting meanssuch as the brackets 27.

The carrier 22 comprises a pair of body and cover members 2S and 29 madeof suitable insulating material and secured together as by means ofclamping nuts 30 so as to detine therebetween the above-mentionedguideway 2l. rihe cover member 29 has a plurality of longitudinally andtransversely spaced openings 32 therein, and the body member 22 has acorresponding number of similarly spaced recesses 33 therein which arelocated below and in coaxial alignment with the openings 32.

The individual switches l? each comprise a pair of cooperatingstationary and movable switch contacts 34 and 35 of which the movablecontact 3S is here shown as being a plunger extending through andslidable in a hollow terminal member 36. The stationary contact 34, ashere shown, is in the form of a sleeve having an expansible upper endinto which the contact plunger 35 is movable for the closed position ofthe switch. Electrical connection the contact plunger 35 is made throughthe terminal member 3o, which also forms a .guide bushing for thecontact plunger for aligning the latter with the hollow stationaryContact 341i.

The hollow stationary contacts 3d of the individual switches i7 arelocated in longitudinal and transverse rows and supporte-:l on theinsulating plete member 25 by being molded in, or otherwise secured to,this plate member. in this instance, the stationary contacts 34- aresleeve-like members extending through the plate member 25, with heads 37on the underside of such plate member and to which electrical conductorscan be soldered or otherwise suitably attached. The terminal members 36located between certain of these openings.

f well as with a power source and with various other components whichmay be embodied in the tube-tester.

The above-nentioned actuating Vstems l ot the individual switches 17 arehere shown as being extensions of the Contact plungers 35 and as beingof a length to extend across the guideway 21 in a directionsubstantially normal to the plane of the guideway. rThe stems ad areprovided adjacent the upper end thereot` with a shoulder 'imeanscomprising lined collars di) which are movable in the recesses 33 of thecarrier 22. The control card 2@ comprises a relatively stili orsemirigid sheet-like member made of paper, cardboard, plastic,

or any other suitable insulating material. As shown in Fig. 6, thiscontrol card is of a generally rectangular shape and has longitudinallyand transversely extending` rows of openings therein with imperforateareas l2 The openings 41, and the imperforate areas d2 where they occur,are located ou the card in such longitudinally and transversely spacedrelation that the openings and areas will be in alignment with the stemst3 when the control card is fully inserted into the guideway 21.

With respect to the control card Ztl, it should be explained furtherthat the imperforate areas 42 are provided be actuated for the dilterenttype of tubes being tested.

The carrier 22 is movable toward and away from the support plate 12 asby means of thrust rods 43 which extend through, and are slidable in,the support structure 16.

The carrier 22 is secured against shouldered portions 44 of the thrustrods 43 by means of the nuts 45. The lower ends of the thrust rods 43extend in depending relation to the support structure 16 and carry athrust plate 46.

Compression springs 47 are disposed around the thrust rods 43 and arelocated between the thrust plate 46 and the lower plate member of thesupport structure 16.

The springs 47 constantly apply a downwardly acting force to the thrustplate 46, such that the thrust rods d3 apply a downward pulling torce tothe carrier 22 tending to move the latter to its lower position inengagement with the support plate l2, as shown in Figs. 3 and 4, andwhich corresponds with the closed-switch position for the individualswitches 17 which were selected for actuation. The carrier 22 is movableto its upper or open-switch position shown in Fig. 2, by an upwardmovement transmitted to the thrust rods 43 by the thrust plate 4o andwhich upward movement also deects the springs i7 to the loaded i orcompressed condition shown in this Fig. 2. The upward actuating movementof the thrust plate 46 is here shown as being produced by a cam 48forming a part of the hereinafter-described actuating and control means23.

The proper control card Ztl is selected and inserted i into the guideway21 while the carrier Z2 is in its upper position shown in Fig. 2. Whenthe carrier 22 is moved downwardly by the actuating and controlmechanism 23,

.. lthe imperforate areas 42 of the selected control card will engagethe upper ends of thestems 18 and will cause a downward actuation of allof the stems which have been engaged by such imperforate areas.

The stems i8 which are located opposite the control card openings willbe substantially unaffected by the movement of the carriage 22 inasmuchas the upper ends of E ese stems will pass freely through the openingsdi or" the card. The downward movement of the stems lil which have beenthus selected and actuated by the imperforate card areas 42, will causethe movable switch contacts to engage in the hollow stationary contacts34 to close the individual switches i7 corresponding with suchimperforate areas of the control card.

During the upward movement ot the carrier 22, the

' collars 4t) of those stems which were previously moved do'-.vn:farfllvby the imperforate areas 42, will be engaged by the transverse lower endwall of the recesses 33 by which a lifting force will be applied tothose particular stems for retracting the switch plungers 35 from thestationary hollow contacts 3ftto cause opening of the previously closedindividual switches 17. Those stems which were not moved downwardly bythe carriage 22 by reason of their extending through the card openings4l, will be substantially unaffected by the upward movement of thecarriage inasmuch as the card openings will again permit a free movementof the card relative to these particular stems.

The use of the compression springs i7 for causing the downwardswitch-closing or working stroke of the carriage 22 represents a verysatisfactory way of producing this working strolre or" the carriageinasmuch as the force of these springs will provide for a very rapidmovement of t .e carriage. The use of these compression springs 47 isalso desirable from the point of View that if some obstruction shouldaccidentally come between the movable switch plungers 35 and thestationary switch contacts 36.'- at the time ot actuation of the device,the springs would permit the downward movement of the carriage 22 to bestopped by the obstruction without causing breakage of the device, suchas would occur if the carriage were being actuated by apositive'torce-applying means connected thereto.

The actuating and control means 23 will be described next and is hereshown with the cam carried by a rockshaft 50 and engaging the undersideof the thrust plate 46. The roclrshaft 59 is suitably journalled inbearings carried by posts or brackets 5l and 52 extending in dependin'Jrelation from the support structure 16. The rockshaft 5@ is provided atthe outer end thereof with a lever arm or crank 53 which is connectedwith an arm projection 54 of a reciprocably removable head 55 by meansof a connecting linky 56. The head 55 is slidably guided on a guide post57 and is adapted to be moved downwardly by a manually operable plunger58 to which the head is connected as by means of a setscrew or pin 59.

The guide post 57 has its upper end secured to the support cover l2 asby means of a screw 6@ and its lower end riveted, or otherwise secured,to a bracket 6l which is connected to the underside of the support coverby one or more screws 62. The manually operable plunger 58 extendsfreely through an opening 6? of the support cover 12 and its lower endslidably extends through a guide opening 64 of the bracket 6l. Acompression spring 65 is disposed between the head 55 and the lowerportion of the bracket 61 and surrounds the plunger 58 and the guidepost 57;

The head 55 is movable downwardly by the manual plunger 58 in oppositionto the compression spring 65 to thereby rock the shaft 5b by movementtransmitted through the connecting link 5o. `Rocking ot the shaft 5?causes a rotary movement of the cam d8 by which the lift portion 43a ofthe cam is made edective on the thrust plate 46 to lift the latter andthereby actuate the carriage 22 through the thrust rods i3 to theopen-switch positiomas well as to load the springs 47.

A holding or locking means is effective on the plunger 58 for retainingthe head 55 in its lowermost position corresponding with the raisedposition of the carrier 22 and is adapted to be released by energizationof an electromagnet 57. This locking means comprises an annular groove63 in the plunger 5S and a latch lever 69 having a forked end 76engageable in the groove 6. The latch lever 69 is mounted on the lowerportion of bracket 6l by a pivot pin '7l about which the latch lever isswingable for engaging the latter in, and disengaging the same from, thegroove 68.

The electromagnet 67 is suitably mounted on the support cover l?. andhas an armature 72 which is movable toward the core 73 in response toenergization of the magnet coil 74. A tension spring 75 extendingbetween the bracket 6l and the armature 72 acts on the armature to movethe same in a direction away from the core 73 and also acts to impartlocking movement to the latch lever 69 through a connecting link '76.With the arrangement just described, it will be seen that upon downwardmanual movement of the plunger S8 to actuate the carrier 22 to its upperposition and load the springs 47 and 65, the latch lever 69 will beautomatically engaged in the groove 63 by the action of the spring 75,such that the holding means will cause the springs 47 and 65 to bemaintained in their loaded condition and will cause the carriage 22 tobe held in its upper position shown in Fig. 2 in readiness to receive aselected control card Zit.

The magnet coil 74 of the electromagnet 67 is contained in an energizingcircuit which includes a control switch '78 of the so-called microswitchtype. The control switch 7S is located adjacent the guideway 2l,preferably at the inner end thereof, by being secured to the supportcover l2 by means of the screws 79. The control switch 78 has anactuating stem 8o projecting therefrom and engageable by a rockablelever tl loosely mounted on a fulcrum screw 82. The lever 31 carries atrigger pin 83 which is movable in a guide sleeve with the free end 83aof the pin extending into the guideway 2l in a position to be engaged bythe inner end of the control card 2li when the latter has been iullyinserted into the guideway.

The iinal portion of the inward movement of the control card 2li causesthe trigger pin 83 to be engaged and actuated by the inner end cf thecard to thereby close the control witch 'i8 and energize theelectromagnet 67. The energization of the electromagnet 67 causesmovement of the armature 72 to thereby swing the latch lever 69 in adirection to disengage the same from the groove 68. The disengagement ofthe latch lever 69 from the groove 68 releases the plunger 5S for upwardmovement of the head 55 by the spring 65. This upward movement of thehead 55 causes rocking of the rockshat 5o for rotating the cam 48 in adirection to release the thrust plate 46 for relatively quick downwardmovement of this plate and the carriage 22 by the springs 47.

The pattern of the imperforate areas d2 of the control card is usuallysuch that the control card is not reverible, but must be inserted intothe guideway in one position only to cooperate with the trigger pin 83for actuating the switch 78. To insure such insertion of the controlcard into the guideway 2l in such one position only, the inner end ofthe control card is provided with a corner notch 85. lf the control cardis inserted in the guideway in an inverted position, the notch 5 willregister with the trigger pin 83 and no actuation of this trigger pinwill be produced. lVhen the control card is inserted into the guidewayin its proper position, however, the notch 85 will be out of registerwith the trigger pin and inelfective, as shown in Fig. l, while theunnotched or full other end corner of the control card will engage andactuate the trigger pin for closing the contacts of the control switch78.

lt may be desirable at times during the use of the selector switchdevice l@ to close certain of the individual switches i? withoutactuating the carriage 22, or to close certain of the individualswitches 37 in addition to those switches already actuated by theimperforate areas of the control card 24B. ri`his can be readily done bymanually applying a downward movement to the stems E3 of the desiredindividual switches 17, or to the stems of the additional individualswitches il? desired to be closed. Since the upper ends of the stems i8of all of the switches i7 are readily accessible regardless of whetherthe carriage 22 is in its upper or lower position, such a manualactuating force can be applied to the stems of the desired switches byengaging a suitable pushing tool against the upper ends thereof.

From the accompanying drawings and the foregoing detailed description,it will now be readily understood that this invention provides amultiple-circuit selector switch device of a very simple and durableconstruction and which can be applied to various uses including that ofselecting and completing the various testing circuits of a tube-tester.it will also be seen that this multiple-circuit selector switch deviceincludes a removable control card for selecting and actuating desiredindividual switches of a switch bank. lt will be seen further, that theactuating means includes a carrier for the control card and anenergizable electromagnetic device controlled by a control switch, andthat such control switch is preferably located adjacent a guideway inthe carrier so as to be actuated in response to movement of the controlcard in such guideway. Additionally, it will be seen that this selectorswitch device utilizes a spring pressure responsive means for theclosing movement of the individual switches, such that breakage will beavoided in the event that proper closing of one of the switches selectedto be actuated is prevented.

Although the multiple-circuit selector switch device of this inventionhas been illustrated and described herein to a somewhat detailed extent,it will be understood, of course, that the invention is not to beregarded as being limited correspondingly in scope, but includes allchanges and modifications coming within the terms of the clairns hereof.

Having thus described my invention, I claim:

1. ln a switch mechanism, a bank of switches having movable projectingactuating stems for the respective switches, means for selecting certainof said switches for actuation including a control card having perforateand imperforate areas of which the latter areas are engageable'with thestems of said certain switches, spring pressure responsive actuatingmeans operable to cause said card to engage and actuate the stems ofsaid certain switches, said actuating means comprising a movable cardcarrier having a guideway for removably receiving said card, holdingmeans for preventing operation of said actuating means, means forreleasing said holding means including an electromagnet having anenergizing circuit, and switch means controlling said circuit andresponsive to movement of said card in said guideway.

2. ln a selector switch mechanism, a support structure, a carriagemovable relative to said support structure and having a guidewaytherein, a control card in said guideway and having spaced openings andspaced imperforate areas, a bank of stationary switch contacts on saidsupport structure, a bank of movable switch contacts for cooperationwith the stationary contacts and including projecting Contact actuatingstems extending in a direction to intersect the plane of said guidewaywith certain of the stems aligned with said openings and other stemsaligned with said imperforate areas, carriage actuating motor meansincluding an electrically energizable means and being operable to causesaid imperforate areas to engage and actuate said other stems, circuitmeans for said energizable means, and control switch means in saidcircuit means and actuatable in response to movement of said card insaid guideway.

3. In a selector switch mechanism, al supportA structure, a carriagemovable relative to said support structure and having a guidewaytherein, a control card in said guideway and having spaced openings andspaced imperforate areas, a bank of stationary switch contacts on saidsupport structure, a bank of movable switch contacts for cooperationwith the stationary contacts and including proiecting contact actuatingstems extending in a direction to intersect the plane of said guidewaywith certain of the stems aligned with said openings and other stemsaligned with said imperforate areas, spring means oliective on saidcarriage for moving said carriage and card in a direction to cause saidimperforate areas to impart switch-closing movement to said other stems,holding means for preventing actuation of the carriage by said springmeans, and means for releasing said holding means.

4. ln a selector switch mechanism, a support structure, a carriagemovable relative to said support structure and having a guidewaytherein, a control card in said guideway and having spaced 'openings andspaced imperforate areas, a bank of stationary switch contacts on saidsupport structure, a bank of movable switch contacts for cooperationwith the stationary contacts and including projecting contact actuatingstems extending in a direction to intersect the plane of said guidewaywith certain of the stems aligned with said openings and other stemsaligned with said imperforate areas, spring means eective ior movingsaid carriage in one direction relative to said structure, cam means formoving said carriage in the opposite direction relative to saidstructure and for preventing operation of said spring means and operableto permit operation of said spring means, means for controlling theoperation of said cam means including an elecnically energizable meanshaving an energizing circuit, and switch means controlling said circuitand responsive to movement of said card in said guideway.

5. ln a selector switch mechanism, a support structure, a carriagemovable relative to said support structure and having a guidewaytherein, a control card in said guideway and having spaced openings andspaced imperforate areas, a bank of stationary switch contacts on saidsupport structure, a bank of movable switch contacts for cooperationwith the stationary contacts and including projecting contact actuatingstems extending in a direction to intersect the plane of said guidewaywith certain of the stems aligned with said openings and other stemsaligned with said imperforate areas, a iirst spring means` effective formoving said carriage relative kto said structure and in a direction tocause actuation of said other stems by said imperforate areas, a camhaving aV lift stroke ei'tective for moving said carriage in theopposite direction in opposition to said rst spring means and a releasestroke for releasing said carriage for actuation by said first springmeans, manually operable means connected with said cam for causing saidlift stroke thereor, a second spring means adapted to be flexed by saidmanually operable means and being eiiective to cause said release strokeof said cam, releasable locking means for preventing said release strokeof said cam by said second spring means, and means for releasing saidlocking means.

6. In a selector switch mechanism, a support structure, a carriagemovable relative to said support structure and having a guidewaytherein, a control card iu said guidewav and having spaced openings andspaced imperforate areas, a bank of stationary switch contacts on saidsupport structure, a bank of movable switch contacts for cooperationwith the stationary contacts and including proiecting contact actuatingstems extending in a direction to intersect the plane of said guidewaywith certain of the stems aligned with said openings and other stemsgoed with said imperforate areas, a iirst spring means ciiective formoving said carriage relative to said structure and in a direction tocause actuation of said other Y stems by said impertorate areas, a camhaving a liftV stroke effective for moving said carriage in the oppositedirection in opposition to said rst spring means and a release strokefor releasing said carriage for actuation by said rst spring means,manually operable means connected with said cam for causing said liftstroke thereof, a second spring means adapted to be flexed by saidmanually operable means and being elective to cause said release strokeof said cam, releasable locking means for preventing said release strokeof said cam by said second spring means, electromagnetic means having anenergizing circuit and being eiiective to release said locking means,and switch means controlling said circuit and responsive to movement ofsaid card in said guideway.

7. In a switch mechanism, a bank of switches having movable projectingactuating stems individual to said switches, means for selecting certainof said switches for actuation including a control card having perforateand imperforate areas of which the latter areas are engageable with thestems of said certain switches, a carriage movable to relatively movesaid stems and said card into engagement with each other and to causesaid card to actuate the stems of said certain switches, spring typeactuating means for moving said carriage, holding means for preventingthe switch-actuating movement of said carriage by said spring typeactuating means, and means for releasing said holding means.

8. in a switch mechanism, a bank of switches having movable projectingactuating stems for the respective switches, means for selecting certainof said switches for ctuation including a control card having perforateand imperforate areas or" which the latter areas are engageable with thestems of said certain switches, a carriage movable for relatively movingsaid stems and said card to engage said stems and said card to cause thelatter to actuate the stems df said certain switches, spring pressureresponsive actuating means for moving said carriage, holding means forpreventing the switch-actuating movement of said carriage and card bysaid actuating means, means for releasing said holding means includingan electromagnet having an energizing circuit, and switch means forcontrolling said circuit.

9. In a switch mechanism, a bank of switches having movable projectingactuating stems for the respective switches, said stems being movable inone direction to produce a closing actuation of said switches and in theopposite direction to produce an opening actuation of said switches,means for selecting certain of said switches for closing actuationincluding a control card having perforate and imperforate areas of whichthe latter areas are engageable with the stems of said certain switches,motor-operated actuating means including an electrically energizablemeans and being operable to cause said card to engage and cause closingactuation of the stems of said certain switches, said actuating meansalso comprising a card holder having a guideway for removably receivingsaid card therein, said holder and stems having cooperably engageableportions for causing opening actuation of the stems of previously closedswitches by said holder, circuit means for energizing said energizablemeans, and control switch means in said circuit means and actuatable inresponse to movement of said card in said guideway.

10. in a selector switch mechanism, amovable carriage having a group oflaterally spaced recesses therein and a group of laterally spacedopenings of relatively smaller transverse dimension communicating withthe respective recesses at one end of the latter, said carriage alsohaving a guideway therein extending transversely of said recesses at theother end of the latter, a bank of switches having movable actuatingstems-projectingtherefrom and extending into said recesses through saidopenings, a control card in said guideway and having spaced areasengageable with certain of said stems, said card being movable with saidcarriage, means for actuating said carriage to engage the spaced cardareas with said certain stems for imparting switch actuating movement tothe latter, and shoulder means on said stems and disposed in saidrecesses.

11. Selector switch mechanism as dened in claim in which the engagementof said card areas with said certain stems imparts switch actuatingmovement to the latter in one direction, said shoulder means beingshiftable in said recesses and being engageable by said carriagesubstantially at said one end of said recesses for causing switchactuating movement in the opposite direction to be imparted to saidstems by said carriage.

12. Selector switch mechanism as defined in claim 10 in which said stemshave end portions extending beyond said shoulder means and said carriagehas other openings therein communicating with said recesses at saidother end of the latter and adapted to receive said end portions of thestems, said control card having spaced openings therein adapted toregister substantially with certain of said other openings.

13. In a selector switch mechanism, a support having a bank ofstationary switch contacts thereon, a carriage having switch closing andswitch opening movements toward and away from said stationary contactsand having an open switch position spaced from said support, saidcarriage having a group of spaced-apart recesses therein and spacedopenings of relatively smaller transverse dimension communicating withthe respective recesses at the ends of the latter facing said stationarycontacts, a bank of contact plungers extending toward said stationarycontacts from said openings, a control card disposed in said carriagefor switch closing movement with the latter, and collars on saidplungers and shittably confined in said recesses, said plungers beingselectively actuatable into engagement with said stationary contacts inresponse to the switch closing movement of said carriage and card, saidcollars being engageable with said carriage at the rst mentioned ends ofsaid recesses for maintaining all of said plungers disengaged from saidstationary contacts while said carriage is in its open switch position.

14. In a selector switch mechanism, a support having a bank ofstationary switch contacts thereon, a carriage having switch closing andswitch opening movements toward and away from said stationary contactsand having an open switch position spaced from said support, saidcarriage having a group of spaced-apart recesses therein and spacedopenings of relatively smaller transverse dimension communicating withthe respective recesses at the ends of the latter facing said stationarycontacts, said carriage also having a guideway therein extending acrosssaid recesses adjacent the other end of the latter, a control cardremovably engaged in said guideway and having imperforate areasoverlying certain of said recesses and openings overlying others of saidrecesses,l a bank of contact plungers extending through said spacedopenings and being individually engageable with the respectivestationary contacts, certain of said plungers being engageable by saidareas for causing actuation of said certain plungers into engagementwith certain of said stationary contacts in response to switch closingmovement of said carriage, and collars on said plungers and confined insaid recesses for causing opening actuation of said certain plungers inresponse to the switch opening movement of said carriage.

l5. Selector switch mechanism as defined in claim 14 in which saidplungers have outer end portions extending beyond said collars andmovable into the openings of said card to prevent closing actuation ofothers of said plungers by said carriage.

References Cited in the tile of this patent UNITED STATES PATENTS2,074,002 Tauschek Mar. 16, 1937 2,198,503 Morrison Apr. 23, 19402,744,973 Murchison May 8, 1956 2,794,869 Noregaard June 4, 1957

